#include <stdio.h>
#include <math.h>
typedef struct POINT
{
    double a;
    double b;
}POINT;
void input_point(POINT *pt)
{
    double x;
    double y;
    scanf("%d %d",&x,&y);
    pt->a=x;
    pt->b=y;
}
double distance(POINT p1, POINT p2)
{
    double c,d;
    c=(p1.a-p2.a)*(p1.a-p2.a)+(p1.b-p2.b)*(p1.b-p2.b);
    d=sqrt(c);
    return d;
}
int main()
{
   POINT p,q;
   double dis;
   input_point(&p);
   input_point(&q);
   dis=distance(p,q);
   printf("%g",dis);
   return 0;
}
请问我的代码哪里不对（主函数由题目给出，不能改动）

[此贴子已经被作者于2017-12-24 02:40编辑过]

double x;
double y;
//scanf("%d %d",&x,&y);
scanf("%lf %lf",&x,&y);

谢谢了